Andrew Garn andrewgarn

Greetings, NSHipsters!

As we prepare to increment our NSDateComponents -year by 1, it's time once again for NSHipster end-of-the-year Reader Submissions! Last year, we got some mind-blowing tips and tricks. With the release of iOS 7 & Mavericks, and a year's worth of new developments in the Objective-C ecosystem, there should be a ton of new stuff to write up for this year.

Submit your favorite piece of Objective-C trivia, framework arcana, hidden Xcode feature, or anything else you think is cool, and you could have it featured in the year-end blowout article. Just comment on this gist below!

Here are a few examples of the kind of things I'd like to see:

Using NSStringFromSelector(@selector()) as a safer way to do KVC / KVO / NSCoding.
Panic's [rather surprising discovery about the internals of the Lightning Digital AV Adapter](http://www.panic.com/blog/the-lightning-di

	#!/bin/bash
	#
	# (Above line comes out when placing in Xcode scheme)
	#

	API_TOKEN=<TestFlight API token here>
	TEAM_TOKEN=<TestFlight team token here>
	SIGNING_IDENTITY="iPhone Distribution: Development Seed"
	PROVISIONING_PROFILE="${HOME}/Library/MobileDevice/Provisioning Profiles/MapBox Ad Hoc.mobileprovision"
	#LOG="/tmp/testflight.log"

	[schwa@ungoliant] ~$ export OBJC_HELP=1
	[schwa@ungoliant] ~$ /Applications/Safari.app/Contents/MacOS/Safari
	objc[10559]: Objective-C runtime debugging. Set variable=YES to enable.
	objc[10559]: OBJC_HELP: describe available environment variables
	objc[10559]: OBJC_PRINT_OPTIONS: list which options are set
	objc[10559]: OBJC_PRINT_IMAGES: log image and library names as they are loaded
	objc[10559]: OBJC_PRINT_LOAD_METHODS: log calls to class and category +load methods
	objc[10559]: OBJC_PRINT_INITIALIZE_METHODS: log calls to class +initialize methods
	objc[10559]: OBJC_PRINT_RESOLVED_METHODS: log methods created by +resolveClassMethod: and +resolveInstanceMethod:
	objc[10559]: OBJC_PRINT_CLASS_SETUP: log progress of class and category setup

	#include <sys/xattr.h>

	/// Set a flag that the files shouldn't be backuped to iCloud.
	+ (void)addSkipBackupAttributeToFile:(NSString *)filePath {
	u_int8_t b = 1;
	setxattr([filePath fileSystemRepresentation], "com.apple.MobileBackup", &b, 1, 0, 0);
	}

	/// Returns the legacy storage path, used when the com.apple.MobileBackup file attribute is not available.
	+ (NSString *)legacyStoragePath {

	//
	// ARC Helper
	//
	// Version 2.2
	//
	// Created by Nick Lockwood on 05/01/2012.
	// Copyright 2012 Charcoal Design
	//
	// Distributed under the permissive zlib license
	// Get the latest version from here:

	function fixpng ()
	{
	if [[ ! -f $1 ]] ; then
	echo "Usage: fixpng <inputFiles> [outputFile]"
	return -1
	else
	local inputFile=$1
	local outputFile=$1
	if [[ -e $2 ]] ; then
	outputFile=$2

	//
	// Copyright (c) 2012-2015 Cédric Luthi / @0xced. All rights reserved.
	//

	#import <Foundation/Foundation.h>

	#if TARGET_OS_SIMULATOR

	static const char *fakeCarrier;
	static const char *fakeTime;

	//
	// CJProperRotationNavigationController.h
	//
	// Created by Charles Joseph on 2012-10-01.
	//

	#import <UIKit/UIKit.h>

	@interface CJProperRotationNavigationController : UINavigationController

	[[NSNotificationCenter defaultCenter] addObserverForName:nil object:nil queue:nil usingBlock:^(NSNotification *note) {
	NSLog(@"%@: %@", note.name, note.userInfo);
	}];

	#import <Foundation/Foundation.h>

	@interface NSObject (Subclasses)

	+ (NSSet *) subclasses_xcd;

	@end